FCC pre-heated steam
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Does the pre-heated steam from the FCC directly affect the catalyst circulation rate? What determines its size? I hope to receive guidance from all the teachers!
What directly affects the catalyst circulation rate is the regeneration slide valve; the amount of pre-heating steam also has a slight influence. Generally, control valves are used on the DCS to regulate this amount. Of course, it should not exceed the specified range for the installation, otherwise it will affect the contact between the catalyst and the oil and gas, increasing the tendency for the catalyst to break down. It is better to use pre-lifted dry gas during normal production.
1. An inappropriate pre-heating steam setting can affect the stability of catalyst flow. 2. The amount of steam to be pre-injected is calculated based on a line speed of 3–4 m/s in the pre-injection section.
Around 0.8 kg/t of catalyst circulation rate
Well, we should first know the circulation rate of the catalyst
The role of the pre-heating steam is mainly to provide a certain amount of drive for the catalyst, and its magnitude should have an impact on the circulation rate. But it is necessary to ensure a certain line speed, such as 3-4 m/s as mentioned by a friend upstairs.
We now ensure that the density during the pre-lift phase is between 400 and 500. Nowadays, pre-lift steam is used very little; most of the time, pre-lift dry gas is used instead